Light emitting element, light emitting device, and method of manufacturing light emitting element

ABSTRACT

A light emitting element includes: a light reflecting member including a first region and a second region; a first semiconductor layered body disposed between the first region and the second region and configured to emit first light having a first peak wavelength; a second semiconductor layered body disposed between the first semiconductor layered body and the second region and configured to emit second light having a second peak wavelength different from the first peak wavelength; a base member disposed between the first semiconductor layered body and the second semiconductor layered body; and a wavelength conversion member on which the first light and the second light is incident, the wavelength conversion member producing third light having a third peak wavelength different from the first peak wavelength and the second peak wavelength.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Japanese Patent Application No.2018-214169, filed on Nov. 14, 2018, the entire contents of which areincorporated herein by reference.

BACKGROUND 1. Technical Field

The present disclosure relates to a light emitting element, a lightemitting device, and a method of manufacturing a light emitting element.

2. Description of Related Art

Light emitting elements are required to have good light emittingcharacteristics (for example, see Japanese Utility Model No. 3197983).

SUMMARY

Certain embodiments of the present invention allows for obtaining alight emitting element and a light emitting device having improved lightemitting characteristics, and a method of manufacturing the lightemitting element.

A light emitting element according to one embodiment of the presentinvention includes: a light reflecting member including a first regionand a second region; a first semiconductor layered body disposed betweenthe first region and the second region and configured to emit firstlight having a first peak wavelength; a second semiconductor layeredbody disposed between the first semiconductor layered body and thesecond region and configured to emit second light having a second peakwavelength different from the first peak wavelength; a base memberdisposed between the first semiconductor layered body and the secondsemiconductor layered body; and a wavelength conversion member on whichthe first light and the second light is incident, the wavelengthconversion member producing third light having a third peak wavelengthdifferent from the first peak wavelength and the second peak wavelength,the wavelength conversion member including a first portion, a secondportion, and a third portion between the first portion and the secondportion in a first direction from the first region to the second regionand facing the base member. The light reflecting member has areflectance to the first light higher than a reflectance of thewavelength conversion member to the first light. The light reflectingmember has a reflectance to the second light is higher than areflectance of the wavelength conversion member to the second light. Aportion of the first region is located between the first portion and aportion of the first semiconductor layered body in a second directionperpendicular to the first direction. A portion of the second region islocated between the second portion and a portion of the secondsemiconductor layered body in the second direction. The first light andthe second light propagate in the base member, and are incident on thethird portion.

A method of manufacturing a light emitting element according to anotherembodiment of the present invention includes: providing a first lightemitting part and a second light emitting part, the first light emittingpart including a first base member and a first semiconductor layeredbody, the second light emitting part including a second base member anda second semiconductor layered body; bonding the first light emittingpart and the second light emitting part to each other such that thefirst base member and the second base member are disposed between thefirst semiconductor layered body and the second semiconductor layeredbody; disposing a light reflecting member to cover the bonded firstlight emitting part and second light emitting part; removing a portionof the light reflecting member to expose a surface of the first basemember and a surface of the second base member; and disposing awavelength conversion member on a surface of the first base member and asurface of the second base member.

A method of manufacturing a light emitting element according to stillanother embodiment of the present invention includes: providing a firstlight emitting part and a second light emitting part, the first lightemitting part including a first base member, a first light reflectingmember, and a first semiconductor layered body between the first basemember and the first light reflecting member, the second light emittingpart including a second base member, a second light reflecting member,and a second semiconductor layered body between the second base memberand the second light reflecting member; bonding the first light emittingpart and the second light emitting part to each other such that thefirst base member and the second base member are disposed between thefirst semiconductor layered body and the second semiconductor layeredbody; removing a portion of the first light reflecting member and aportion of the second light reflecting member to expose a surface of thefirst base member and a surface of the second base member; and disposinga wavelength conversion member on the exposed surface of the first basemember and the exposed surface of the second base member.

Certain embodiments of the present disclosure allow for obtaining alight emitting element and a light emitting device having improved lightemitting characteristics, and a method of manufacturing the lightemitting element.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic perspective view illustrating a light emittingelement and a light emitting device according to a first embodiment.

FIG. 2 is a schematic cross-sectional view illustrating the lightemitting element and the light emitting device according to the firstembodiment at a cross-section taken along line II-II in FIG. 1.

FIG. 3 is a schematic cross-sectional view illustrating the lightemitting element and the light emitting device according to the firstembodiment at a cross-section taken along line III-III in FIG. 1.

FIG. 4 is a schematic cross-sectional view illustrating the lightemitting element and the light emitting device according to the firstembodiment at a cross-section taken along line IV-IV in FIG. 1.

FIG. 5 is a schematic cross-sectional view illustrating the lightemitting element and the light emitting device according to the firstembodiment at a cross-section taken along line V-V in FIG. 1.

FIG. 6 is a schematic cross-sectional view illustrating the lightemitting element and the light emitting device according to the firstembodiment at a cross-section taken along line VI-VI in FIG. 1.

FIG. 7 is a schematic cross-sectional view illustrating the lightemitting element and the light emitting device according to the firstembodiment.

FIG. 8 is a schematic cross-sectional view illustrating the lightemitting element and the light emitting device according to the firstembodiment.

FIG. 9 is a schematic diagram illustrating the light emitting deviceaccording to the first embodiment.

FIG. 10A is a schematic cross-sectional view illustrating a method ofmanufacturing a light emitting element according to a second embodiment.

FIG. 10B is a schematic cross-sectional view illustrating the method ofmanufacturing a light emitting element according to the secondembodiment.

FIG. 10C is a schematic cross-sectional view illustrating the method ofmanufacturing a light emitting element according to the secondembodiment.

FIG. 11A is a schematic cross-sectional view illustrating the method ofmanufacturing a light emitting element according to the secondembodiment.

FIG. 11B is a schematic cross-sectional view illustrating the method ofmanufacturing a light emitting element according to the secondembodiment.

FIG. 12 is a schematic cross-sectional view illustrating the method ofmanufacturing a light emitting element according to the secondembodiment.

FIG. 13A is a schematic cross-sectional view illustrating the method ofmanufacturing a light emitting element according to the secondembodiment.

FIG. 13B is a schematic cross-sectional view illustrating the method ofmanufacturing a light emitting element according to the secondembodiment.

FIG. 14 is a schematic cross-sectional view illustrating the method ofmanufacturing a light emitting element according to the secondembodiment.

DETAILED DESCRIPTION OF EMBODIMENTS

Hereinafter, certain embodiments of the present disclosure will bedescribed with reference to the drawings.

The drawings are schematic, and the relationship between a thickness anda width of a component in the drawings, ratios between sizes of portionsin the drawings, and the like may not be the same as those in actuallight emitting devices. Further, the same portion may be illustratedwith different dimensions or ratios among the drawings.

In the specification of the present application, the same elements asthose described earlier with reference to the drawings may be denoted bythe same reference numerals, and detailed descriptions thereof may beomitted as appropriate.

First Embodiment

FIG. 1 is a schematic perspective view showing an example of a lightemitting element and an example of a light emitting device according toa first embodiment.

FIGS. 2 to 6 are schematic cross-sectional views showing an example ofthe light emitting element and an example of the light emitting deviceaccording to the first embodiment.

FIG. 2 illustrates a cross-section taken along line II-II in FIG. 1.FIG. 3 illustrates a cross-section taken along line III-III in FIG. 1.FIG. 4 illustrates a cross-section taken along line IV-IV in FIG. 1.FIG. 5 illustrates a cross-section taken along line V-V in FIG. 1. FIG.6 illustrates a cross-section taken along line VI-VI in FIG. 1.

As shown in FIG. 1, a light emitting device 210 includes a lightemitting element 110 and a mounting member 60. The light emittingelement 110 is disposed on the mounting member 60.

As shown in FIG. 2, the light emitting element 110 includes a lightreflecting member 40, a first semiconductor layered body 11, a secondsemiconductor layered body 12, a base member 20 and a wavelengthconversion member 30.

The light reflecting member 40 includes a first region 41 and a secondregion 42. As described below, the light reflecting member 40 mayfurther include a third region 43, a fourth region 44 and a fifth region45.

The first semiconductor layered body 11 is located between the firstregion 41 and the second region 42. The first semiconductor layered body11 is configured to emit first light having a first peak wavelength.

The first semiconductor layered body 11 includes, for example, a firstn-type semiconductor layer 11 n, a first light emitting layer 11 e, anda first p-type semiconductor layer 11 p. The first p-type semiconductorlayer 11 p is located between the first n-type semiconductor layer 11 nand the first region 41. The first light emitting layer 11 e is locatedbetween the first n-type semiconductor layer 11 n and the first p-typesemiconductor layer 11 p.

The second semiconductor layered body 12 is located between the firstsemiconductor layered body 11 and the second region 42. The secondsemiconductor layered body 12 is configured to emit second light havinga second peak wavelength. The second peak wavelength is different fromthe first peak wavelength.

The second semiconductor layered body 12 includes, for example, a secondn-type semiconductor layer 12 n, a second light emitting layer 12 e anda second p-type semiconductor layer 12 p. The second p-typesemiconductor layer 12 p is located between the second n-typesemiconductor layer 12 n and the second region 42. The second lightemitting layer 12 e is located between the second n-type semiconductorlayer 12 n and the second p-type semiconductor layer 12 p.

When a current is supplied to the first semiconductor layered body 11,first light is emitted from the first light emitting layer 11 e. When acurrent is supplied to the second semiconductor layered body 12, secondlight is emitted from the second light emitting layer 12 e. The firstlight is, for example, blue light. The second light is, for example,green light. The first peak wavelength is, for example, in a range of430 nm to 480 nm. The second peak wavelength is, for example, in a rangeof 500 nm to 540 nm.

The base member 20 is located between the first semiconductor layeredbody 11 and the second semiconductor layered body 12. In this example,the base member 20 includes a first base member 21 and a second basemember 22. The second base member 22 is located between the first basemember 21 and the second semiconductor layered body 12. In this example,the second base member 22 is in contact with the first base member 21.For example, a surface of the second base member 22 on which the secondsemiconductor layered body 12 is not disposed is in contact with asurface of the first base member 21 on which the first semiconductorlayered body 11 is not disposed.

In one example, nitride semiconductors may be used for the firstsemiconductor layered body 11 and the second semiconductor layered body12. For the base member 20, for example, sapphire is used. For the firstbase member 21 and the second base member 22, for example, sapphire isused. The first semiconductor layered body 11 is epitaxially grown onthe first base member 21. The second semiconductor layered body 12 isepitaxially grown on the second base member 22.

The first light emitted from the first light emitting layer 11 e isincident on the first base member 21, and propagates in the first basemember 21 and the second base member 22. The second light emitted fromthe second light emitting layer 12 e is incident on the second basemember 22, and propagates in the first base member 21 and the secondbase member 22.

As used herein, the direction from the first region 41 to the secondregion 42 is referred to as a “first direction” or an “X-axisdirection”. Further, as used herein, a direction perpendicular to theX-axis direction is referred to as a “Z-axis direction”, and a directionperpendicular to the X-axis direction and the Z-axis direction isreferred to as a “Y-axis direction”.

As described above, the first semiconductor layered body 11 and thesecond semiconductor layered body 12 are located between the firstregion 41 and the second region 42 in the X-axis direction.

On the other hand, the direction from the wavelength conversion member30 to the first semiconductor layered body 11 crosses the X-axisdirection. The direction from the wavelength conversion member 30 to thesecond semiconductor layered body 12 crosses the X-axis direction.

The wavelength conversion member 30 includes, for example, a firstportion 31, a second portion 32 and a third portion 33. The thirdportion 33 is located between the first portion 31 and the secondportion 32 in the X-axis direction (i.e., first direction from the firstregion 41 to the second region 42). The third portion 33 faces the basemember 20 (i.e., first base member 21 and second base member 22) in theZ-axis direction. The first light and the second light are incident onthe wavelength conversion member 30. For example, the first light andthe second light propagate in the base member 20, and is incident on thethird portion 33. The first light and the second light may be incidenton the first portion 31 and the second portion 32. The wavelengthconversion member 30 produces third light having a third peakwavelength. The third peak wavelength is different from the first peakwavelength, and is also different from the second peak wavelength.Examples of the wavelength conversion member 30 include a fluorescentmaterial.

In one example, the first light is blue light, the second light is greenlight, and the third light is yellow light. A light emitted from thewavelength conversion member 30 includes first light, second light andthird light. A light emitted from the wavelength conversion member 30(light emitted from the light emitting element 110) is, for example,white light.

The reflectance of the light reflecting member 40 to the first light ishigher than the reflectance of the wavelength conversion member 30 tothe first light. The reflectance of the light reflecting member 40 tothe second light is higher than the reflectance of the wavelengthconversion member 30 to the second light. With a high reflectance of thelight reflecting member 40, the first light and the second light can bereflected toward the base member 20 by the light reflecting member 40,can propagate through the base member 20, and can be efficientlyincident on the wavelength conversion member 30.

For example, the base member 20 is in contact with the wavelengthconversion member 30. For example, the base member 20 and the thirdportion 33 of the wavelength conversion member 30 are in contact witheach other. The first light and the second light having propagatedthrough the base member 20 can be directly incident on the wavelengthconversion member 30.

In the first embodiment, a portion of the first region 41 is locatedbetween the first portion 31 and a portion of the first semiconductorlayered body 11 in a second direction (Z-axis direction in this example)orthogonal to the first direction. A portion of the second region 42 islocated between the second portion 32 and a portion of the secondsemiconductor layered body 12 in the second direction (Z-axis directionin this example).

As shown in FIG. 2, for example, a portion of the first region 41 islocated between the first portion 31 and the first light emitting layer11 e in the Z-axis direction. This allows for reducing direct incidenceof first light, which is generated in the first light emitting layer 11e, on the wavelength conversion member 30. For example, a portion of thesecond region 42 is located between the second portion 32 and the secondlight emitting layer 12 e in the Z-axis direction. This allows forreducing direct incidence of second light, which is generated in thesecond light emitting layer 12 e, on the wavelength conversion member30. A portion of the first region 41 may be in contact with, forexample, the base member 21. This allows for reducing direct incidenceof first light, which is generated in the first semiconductor structure11, on the wavelength conversion member 30. A portion of the secondregion 42 may be in contact with, for example, the base member 22. Thisallows for reducing direct incidence of second light, which is generatedin the second semiconductor structure 12, on the wavelength conversionmember 30.

For example, in a first reference example, the first light emittinglayer 11 e and the second light emitting layer 12 e are in contact withthe wavelength conversion member 30. In the configuration of the firstreference example, the first light generated in the first light emittinglayer 11 e and the second light generated in the second light emittinglayer 12 e are directly incident on the wavelength conversion member 30.In this case, when light of different colors is incident on two portionsof the wavelength conversion member 30 (for example, the first portion31 and the second portion 32), for example, blue light and green lightare separately emitted from the light emitting element 110. Accordingly,blue light and green light may not be sufficiently mixed, so that colorof light emitted from the light emitting element 110 may be uneven.

On the other hand, in the first embodiment, the first light and thesecond light are reflected and propagate inside the base member 20.Accordingly, light with a mixed color, in which a color of first lightand a color of second light is sufficiently mixed, can be incident onthe wavelength conversion member 30. This allows for obtaining light ina wide range of colors. According to the first embodiment, it ispossible to provide a light emitting element in which light emittingcharacteristics can be improved.

In the first embodiment, a portion of the first n-type semiconductorlayer 11 n and a portion of the second n-type semiconductor layer 12 nmay be in contact with the wavelength conversion member 30. The firstlight and the second light may propagate in the base member 20, thefirst n-type semiconductor layer 11 n, and the second n-typesemiconductor layer 12 n, and be incident on the wavelength conversionmember 30. Accordingly, the first light and the second light arereflected and propagate inside the base member 20, which causes a colorof first light and a color of second light to be sufficiently mixed, andare then incident on the wavelength conversion member 30 with colorsthat are sufficiently mixed.

In the first embodiment, a portion of the first region 41 may be locatedbetween the first portion 31 and at least a portion of the firstsemiconductor layered body 11 in the second direction (i.e., z-axisdirection). A portion of the second region 42 may be located between thesecond portion 32 and at least a portion of the second semiconductorlayered body 12 in the second direction (i.e., z-axis direction). Withthis structure, direct incidence of light emitted from the lightemitting layer on the wavelength conversion member 30 can be reduced.

For example, at least a portion of the first n-type semiconductor layer11 in is in contact with the first portion 31. A portion of the firstregion 41 is located between the first portion 31 and the first p-typesemiconductor layer 11 p in the second direction (for example z-axisdirection). A portion of the first region 41 is located between thefirst portion 31 and the first light emitting layer 11 e in the seconddirection.

For example, at least a portion of the second n-type semiconductor layer12 n is in contact with the second portion 32. A portion of the secondregion 42 is located between the second portion 32 and the second p-typesemiconductor layer 12 p in the second direction (for example z-axisdirection). A portion of the second region 42 is located between thesecond portion 32 and the second light emitting layer 12 e in the seconddirection.

As shown in FIG. 1 and FIGS. 4 to 6, the light reflecting member 40 mayfurther include the third region 43, the fourth region 44, and the fifthregion 45.

The first semiconductor layered body 11, the second semiconductorlayered body 12 and the base member 20 are located between the thirdregion 43 and the fourth region 44 in a third direction. The thirddirection is perpendicular to a plane extending along the firstdirection and the second direction. The third direction is, for example,a Y-axis direction. The first semiconductor layered body 11, the secondsemiconductor layered body 12, and the base member 20 are locatedbetween the wavelength conversion member 30 and the fifth region 45 ofthe light reflecting member 40 in the second direction (for example, aZ-axis direction).

The first light and the second light are reflected by the third region43, the fourth region 44, and the fifth region 45. Accordingly, emissionof first light and second light to the outside through the lightreflecting member 40 can be reduced, and the first light and the secondlight can propagate in the base member 20 are efficiently incident onthe wavelength conversion member 30.

As shown in FIGS. 2 and 3, the light emitting element 110 furtherincludes a first n-side electrode 51 n and a first p-side electrode 51p. The first n-side electrode 51 n is electrically connected to thefirst n-type semiconductor layer 11 n. The first p-side electrode 51 pis electrically connected to the first p-type semiconductor layer 11 p.

In this example, the first n-side electrode 51 n is electricallyconnected to the first n-type semiconductor layer 11 n via a firstn-side electrically conductive member 51 nP. The first p-side electrode51 p is electrically connected to the first p-type semiconductor layer11 p via a first p-side electrically conductive member 51 pP.

At least a portion of the first n-side electrode 51 n is exposed fromthe first region 41. At least a portion of the first n-side electrode 51n is not covered with the first region 41. At least a portion of thefirst p-side electrode 51 p is exposed from the first region 41. Atleast a portion of the first p-side electrode 51 p is not covered withthe first region 41.

A current is supplied to the first semiconductor layered body 11 throughthe first n-side electrode 51 n and the first p-side electrode 51 p, sothat first light is emitted from the first light emitting layer 11 e.

As shown in FIGS. 2 and 3, the light emitting element 110 includes asecond n-side electrode 52 n and a second p-side electrode 52 p. Thesecond n-side electrode 52 n is electrically connected to the secondn-type semiconductor layer 12 n. The second p-side electrode 52 p iselectrically connected to the second p-type semiconductor layer 12 p.

In this example, the second n-side electrode 52 n is electricallyconnected to the second n-type semiconductor layer 12 n via a secondn-side electrically conductive member 52 nP. The second p-side electrode52 p is electrically connected to the second p-type semiconductor layer12 p via a second p-side electrically conductive member 52 pP.

At least a portion of the second n-side electrode 52 n is exposed fromthe second region 42. At least a portion of the second n-side electrode52 n is not covered with the second region 42. At least a portion of thesecond p-side electrode 52 p is exposed from the second region 42. Atleast a portion of the second p-side electrode 52 p is not covered withthe second region 42.

A current is supplied to the second semiconductor layered body 12through the second n-side electrode 52 n and the second p-side electrode52 p, so that first light is emitted from the second light emittinglayer 12 e.

In this example, the mounting member 60 includes a mounting substrateportion 65, a first n-side electrically conductive layer 61 n, a firstp-side electrically conductive layer 61 p, a second n-side electricallyconductive layer 62 n and a second p-side electrically conductive layer62 p. The first n-side electrically conductive layer 61 n, the firstp-side electrically conductive layer 61 p, the second n-sideelectrically conductive layer 62 n and the second p-side electricallyconductive layer 62 p are disposed on the mounting substrate portion 65.

The first n-side electrically conductive layer 61 n is located betweenthe mounting substrate portion 65 and the first n-side electrode 51 n.The first p-side electrically conductive layer 61 p is located betweenthe mounting substrate portion 65 and the first p-side electrode 51 p.The second n-side electrically conductive layer 62 n is located betweenthe mounting substrate portion 65 and the second n-side electrode 52 n.The second p-side electrically conductive layer 62 p is located betweenthe mounting substrate portion 65 and the second p-side electrode 52 p.

For example, the first n-side electrode 51 n and the first n-sideelectrically conductive layer 61 n are electrically connected to eachother via a first n-side connection member 61 nA. The first p-sideelectrode 51 p and the first p-side electrically conductive layer 61 pare electrically connected to each other via a first p-side connectionmember 61 pA. The second n-side electrode 52 n and the second n-sideelectrically conductive layer 62 n are electrically connected to eachother via a second n-side connection member 62 nA. The second p-sideelectrode 52 p and the second p-side electrically conductive layer 62 pare electrically connected to each other via a second p-side connectionmember 62 pA. Examples of the connection members include solder.

For example, a current is supplied to the first semiconductor layeredbody 11 through the first n-side electrically conductive layer 61 n andthe first p-side electrically conductive layer 61 p. A current issupplied to the second semiconductor layered body 12 through the secondn-side electrically conductive layer 62 n and the second p-sideelectrically conductive layer 62 p.

As shown in FIG. 2, the first region 41 includes a first end portion ep1and a second end portion ep2. The second end portion ep2 is locatedbetween the first end portion ep1 and the first portion 31 in the seconddirection (Z-axis direction in this example).

The first n-side electrode 51 n includes a first electrode end portion51 na and a second electrode end portion 51 nb. The second electrode endportion 51 nb is located between the first electrode end portion 51 naand the first portion 31 in the second direction (Z-axis direction inthis example).

The first electrode end portion 51 na and the first end portion ep1 arein the same plane. For example, the direction from the first electrodeend portion 51 na to the first end portion ep1 is along the firstdirection (X-axis direction).

As shown in FIG. 3, the first p-side electrode 51 p includes a thirdelectrode end portion 51 pc and a fourth electrode end portion 51 pd.The fourth electrode end portion 51 pd is located between the thirdelectrode end portion 51 pc and the first portion 31 in the seconddirection (Z-axis direction in this example).

The third electrode end portion 51 pc and the first end portion ep1 arein the same plane. For example, the direction from the third electrodeend portion 51 pc to the first end portion ep1 is along the firstdirection (X-axis direction).

As shown in FIG. 2, the second region 42 includes a third end portionep3 and a fourth end portion ep4. The fourth end portion ep4 is locatedbetween the third end portion ep3 and the second portion 32 in thesecond direction (Z-axis direction in this example).

The second n-side electrode 52 n includes a fifth electrode end portion52 ne and a sixth electrode end portion 52 nf. The sixth electrode endportion 52 nf is present between the fifth electrode end portion 52 neand the second portion 32 in the second direction (Z-axis direction inthis example).

The fifth electrode end portion 52 ne and the third end portion ep3 arein the same plane. For example, the direction from the fifth electrodeend portion 52 ne to the third end portion ep3 is along the firstdirection (X-axis direction).

As shown in FIG. 3, the second p-side electrode 52 p includes a seventhelectrode end portion 52 pg and an eighth electrode end portion 52 ph.The eighth electrode end portion 52 ph is located between the seventhelectrode end portion 52 pg and the second portion 32 in the seconddirection (Z-axis direction in this example).

The seventh electrode end portion 52 pg and the third end portion ep3are in the same plane. For example, the direction from the seventhelectrode end portion 52 pg to the third end portion ep3 is along thefirst direction (X-axis direction).

With the electrode end portion and the end portion of the lightreflecting member 40 located in the same plane, an end portion of thelight emitting element 110 at the fifth region 45 side is substantiallya plane surface. This allows for facilitating mounting of the lightemitting element 110 on the mounting member 60.

As shown in FIGS. 1, 2 and 3, the second n-side electrode 52 n and thesecond p-side electrode 52 p are located at the mounting member 60 sideon a lateral surface of the light reflecting member 40. As shown inFIGS. 2 and 3, the first n-side electrode 51 n and the first p-sideelectrode 51 p are located at the mounting member 60 side on a lateralsurface of the light reflecting member 40. This allows for facilitatingmounting of the light emitting element 110 on the mounting member 60.

As shown in FIGS. 2 and 3, the light emitting element 110 may furtherinclude a first reflecting film 11 f. The first reflecting film 11 f islocated between the first region 41 and at least a portion of the firstsemiconductor layered body 11 in the first direction (X-axis direction).The light emitting element 110 may further include a second reflectingfilm 12 f. The second reflecting film 12 f is located between the secondregion 42 and a portion of the second semiconductor layered body 12 inthe first direction (X-axis direction). The first reflecting film 11 fand the second reflecting film 12 f contain, for example, at least oneselected from the group consisting of Ag and Al. Light emitted from thelight emitting layer is efficiently reflected toward the base member 20by the first reflecting film 11 f and the second reflecting film 12 f.

As shown in FIG. 2, the light reflecting member 40 contains a pluralityof first particles 40 p, and a first member 40 q surrounding each of theplurality of first particles 40 p. The plurality of first particles 40 pincludes, for example, at least one selected from the group consistingof titanium oxide and aluminum oxide. The first member 40 q includes,for example, at least one selected from the group consisting of asilicone resin, an acrylic resin and an epoxy resin. The first member 40q may include, for example, glass or ceramics.

As shown in FIG. 2, the wavelength conversion member 30 includes aplurality of second particles 30 p, and a second member 30 q surroundingeach of a plurality of second particles 30 p. The plurality of secondparticles 30 p includes, for example, a fluorescent material. The secondmember 30 q includes, for example, at least one selected from the groupconsisting of a silicone resin, an acrylic resin and an epoxy resin.

In the light emitting element 110, the first base member 21 is directlybonded to the second base member 22. For example, direct bonding betweenthe first base member 21 and the second base member 22 allows for easilyincreasing heat dissipation performance. In the first embodiment, aboundary between the first base member 21 and the second base member 22may be unclear. For direct bonding, for example, normal temperaturebonding such as atomic diffusion bonding or surface activation bondingis employed.

In the first embodiment, an additional layer may be further disposedbetween the first base member 21 and the second base member 22 asdescribed below.

FIGS. 7 and 8 are schematic cross-sectional views illustrating a lightemitting element 111 and the light emitting device 210 according to thefirst embodiment.

As shown in FIGS. 7 and 8, the light emitting element 111 according tothe first embodiment includes the light reflecting member 40, the firstsemiconductor layered body 11, the second semiconductor layered body 12,the base member 20, and the wavelength conversion member 30. The basemember 20 includes an intermediate layer 25 in addition to the firstbase member 21 and the second base member 22. The light reflectingmember 40, the first semiconductor layered body 11, the secondsemiconductor layered body 12, and the wavelength conversion member 30in the light emitting element 111 may have structures that are the sameas those in the light emitting element 110. An example of the basemember 20 in the light emitting element 111 will be described below.

In the light emitting element 111, the second base member 22 is locatedbetween the first base member 21 and the second semiconductor layeredbody 12. The intermediate layer 25 is located between the first basemember 21 and the second base member 22.

For example, the intermediate layer 25 bonds the first base member 21and the second base member 22. The intermediate layer 25 is, forexample, an adhesive layer. The intermediate layer 25 includes, forexample, a resin. For example, part of the intermediate layer 25 is incontact with the wavelength conversion member 30.

First light emitted from the first light emitting layer 11 e passesthrough the first base member 21, and is incident on the intermediatelayer 25. Second light emitted from the second light emitting layer 12 epasses through the second base member 22, and is incident on theintermediate layer 25. The first light and the second light propagate inthe intermediate layer 25, so that the first light and the second lightare incident on the wavelength conversion member 30 in a state in whicha color of the first light and a color of the second light are mixedwell. According to the first embodiment, it is possible to provide alight emitting element in which light emitting characteristics can beimproved.

In the first embodiment, the absolute value of a difference between therefractive index of the intermediate layer 25 for the first light andthe refractive index of the first base member 21 for the first light issmaller than the absolute value of a difference between the refractiveindex of the first semiconductor layered body 11 for the first light andthe refractive index of the first base member 21 for the first light.With this configuration, for example, absorption of light at aninterface between the intermediate layer 25 and the first base member 21can be reduced. Accordingly, optical loss is reduced, so that lightemission efficiency can be increased.

In the first embodiment, the absolute value of a difference between therefractive index of the intermediate layer 25 for the second light andthe refractive index of the second base member 22 for the second lightis smaller than the absolute value of a difference between therefractive index of the second semiconductor layered body 12 for thesecond light and the refractive index of the second base member 22 forthe second light. With this configuration, for example, absorption oflight at an interface between the intermediate layer 25 and the secondbase member 22 is suppressed. Accordingly, optical loss is reduced, sothat light emission efficiency can be increased.

FIG. 9 is a schematic diagram showing a light emitting device 211according to the first embodiment.

As shown in FIG. 9, the light emitting device 211 includes the lightemitting element 110 and a driving circuit 70. The light emitting device211 may include the light emitting element 111 and a driving circuit 70.

The driving circuit 70 is electrically connected to the firstsemiconductor layered body 11 and the second semiconductor layered body12. For example, the driving circuit 70 is electrically connected to thefirst n-side electrode 51 n via a first wire 71. The driving circuit 70is electrically connected to the first p-side electrode 51 p via asecond wire 72. The driving circuit 70 is electrically connected to thesecond n-side electrode 52 n via a third wire 73. The driving circuit 70is electrically connected to the second p-side electrode 52 p via afourth wire 74.

The driving circuit 70 is configured to supply a first current to thefirst semiconductor layered body 11, and to supply a second current tothe second semiconductor layered body 12. The driving circuit 70 isconfigured to individually change the current values of the firstcurrent and the second current. Individually driving the firstsemiconductor layered body 11 and the second semiconductor layered body12 allows for easily obtaining a desired emission color.

Second Embodiment

A method of manufacturing a light emitting element according to a secondembodiment of the present invention will be described below.

FIGS. 10A to 10C and FIGS. 11A and 11B are schematic cross-sectionalviews illustrating the method of manufacturing a light emitting elementaccording to the second embodiment.

As shown in FIG. 10A, a first light emitting part 10A and a second lightemitting part 10B are provided. The first light emitting part 10Aincludes a first base member 21 and a first semiconductor layered body11. The second light emitting part 10B includes a second base member 22and a second semiconductor layered body 12.

As shown in FIG. 10B, the first light emitting part 10A and the secondlight emitting part 10B are bonded to each other such that the firstbase member 21 and the second base member 22 are disposed between thefirst semiconductor layered body 11 and the second semiconductor layeredbody 12. The first base member 21 and the second base member 22 arebonded to each other using, for example, direct bonding in whichpressure is applied at a normal temperature.

As shown in FIG. 10C, a light reflecting member 40 is formed such thatthe light reflecting member 40 integrally covers the first lightemitting part 10A and second light emitting part 10B that are bondedtogether.

As shown in FIG. 11A, a first n-side electrically conductive member 51nP, a first n-side electrode 51 n, a second n-side electricallyconductive member 52 nP, and a second n-side electrode 52 n are formed.Further, a first p-side electrically conductive member 51 pP, a firstp-side electrode 51 p, a second p-side electrically conductive member 52pP and a second p-side electrode 52 p are formed as shown in FIG. 3. Forexample, a portion of the light reflecting member 40 is removed toexpose a first n-type semiconductor layer 11 n and a second n-typesemiconductor layer 12 n from the light reflecting member 40. The firstn-side electrically conductive member 51 nP is formed to be connected tothe first n-type semiconductor layer 11 n exposed from the lightreflecting member 40. The second n-side electrically conductive member52 nP is formed to be connected to the second n-type semiconductor layer12 n exposed from the light reflecting member 40. The first n-sideelectrode 51 is formed to be in contact with the light reflecting member40 and to be connected to the first n-side electrically conductivemember 5 nP. The second n-side electrode 52 is formed to be in contactwith the light reflecting member 40 and to be connected to the secondn-side electrically conductive member 52 nP.

As shown in FIG. 11A, a portion of the light reflecting member 40 isremoved to expose a surface of the first base member 21 and a surface ofthe second base member 22. The removal of a portion of the lightreflecting member 40 is performed by, for example, polishing. Theremoval is performed such that a portion of the light reflecting member40 in a region provided with the first n-side electrode 51 n and thesecond n-side electrode 52 n remains.

As shown in FIG. 11B, a wavelength conversion member 30 is formed on asurface of the first base member 21 and a surface of the second basemember 22 that are exposed from the light reflecting member 40. Thewavelength conversion member 30 may be disposed continuously on theexposed surface of the first base member 21 and the exposed surface ofthe second base member 22 and a surface of the light reflecting member40 continuously.

In this manner, the light emitting element 110 is obtained. According tothe second embodiment, it is possible to provide a method ofmanufacturing a light emitting element in which light emittingcharacteristics can be improved.

FIG. 12 is a schematic cross-sectional view illustrating a method ofmanufacturing a light emitting element according to the secondembodiment. As shown in FIG. 12, the first light emitting part 10A andthe second light emitting part 10B are provided, and then anintermediate layer 25 is disposed between the first base member 21 andthe second base member 22. For example, the first base member 21 and thesecond base member 22 are bonded with a resin that forms theintermediate layer 25.

Thereafter, treatment as described with reference to FIGS. 10C, 11A and11B is performed. In this manner, the light emitting element 111 isobtained. According to the second embodiment, it is possible to providea method of manufacturing a light emitting element in which lightemitting characteristics can be improved.

FIGS. 13A and 13B are schematic cross-sectional views illustratinganother method of manufacturing a light emitting element according tothe second embodiment.

As shown in FIG. 13A, the first light emitting part 10A and the secondlight emitting part 10B are provided. The first light emitting part 10Aincludes the first base member 21, a first light reflecting member 40A,and the first semiconductor layered body 11 disposed between the firstbase member 21 and the first light reflecting member 40A. The firstlight reflecting member 40A covers surfaces of the first base member 21except for a surface of the first base member 21 opposite to a surfaceof the first base member 21 provided with the first semiconductorlayered body 11. The second light emitting part 10B includes the secondbase member 22, a second light reflecting member 40B, and the secondsemiconductor layered body 12 disposed between the second base member 22and the second light reflecting member 40B. The second light reflectingmember 40B covers surfaces of the second base member 22 except for asurface of the second base member 22 opposite to a surface of the secondbase member 22 provided with the second semiconductor layered body 12.

As shown in FIG. 13B, the first light emitting part 10A and the secondlight emitting part 10B are bonded to each other such that the firstbase member 21 and the second base member 22 are disposed between thefirst semiconductor layered body 11 and the second semiconductor layeredbody 12. In this bonding, the first base member 21 and the second basemember are bonded to each other using direct bonding. A first lightreflecting member 41 and a second light reflecting member 42 may bebonded to each other using direct bonding.

Thereafter, the step described above with reference to FIG. 11A iscarried out. For example, the first n-side electrically conductivemember 51 nP, the first n-side electrode 51 n, the second n-sideelectrically conductive member 52 nP, the second n-side electrode 52 n,the first p-side electrically conductive member 51 pP, the first p-sideelectrode 51 p, the second p-side electrically conductive member 52 pP,and the second p-side electrode 52 p are formed.

Thereafter, the steps described above with reference to FIGS. 11A and11B are carried out. For example, a portion of the first lightreflecting member 40A and a portion of the second light reflectingmember 40B are removed to expose a surface of the first base member 21and a surface of the second base member 22. The wavelength conversionmember 30 is disposed on the exposed surface of the first base member 21and the exposed surface of the second base member 22. The light emittingelement 110 is obtained in this manner. According to the secondembodiment, it is possible to provide a method of manufacturing a lightemitting element that can emit light in a wide range of colors and inwhich light emitting characteristics can be improved.

FIG. 14 is a schematic cross-sectional view illustrating the method ofmanufacturing a light emitting element according to the secondembodiment.

As shown in FIG. 14, the first light emitting part 10A including thefirst light reflecting member 40A, and the second light emitting part10B including the second light reflecting member 40B are provided, andthe intermediate layer 25 is then disposed between the first base member21 and the second base member 22. For example, the first base member 21and the second base member 22 are bonded with a resin that forms theintermediate layer 25.

Thereafter, the steps described above with reference to FIGS. 10C, 11Aand 11B are carried out. In this manner, the light emitting element 111is obtained. According to the second embodiment, it is possible toprovide a method of manufacturing a light emitting element with whichlight in a wide range of colors can be obtained and light emittingcharacteristics can be improved.

For example, the light emitting element according to certain embodimentsmay be used for backlights or lighting systems. Certain embodimentsallow for obtaining light in which colors are mixed well. Additionally,for example, a thin backlight can be obtained.

According to certain embodiments, a light emitting element with improvedlight emitting characteristics, a light emitting device; and a method ofmanufacturing a light emitting element can be obtained.

In the specification of the present application, the terms“perpendicular” and “parallel” encompass not only exactly perpendicularconfiguration and exactly parallel configurations but alsoconfigurations slightly deviated from an exactly perpendicularconfiguration and an exactly parallel configurations, respectively, dueto manufacturing variations, etc. That is, the terms “perpendicular” and“parallel” encompass substantially perpendicular and substantiallyparallel configurations, respectively.

Certain embodiments of the present invention have been described abovewith reference to specific examples. However, the present disclosure isnot limited to these specific examples. For example, specificconfigurations of each of the base member, the semiconductor layeredbody, the light reflecting member, the wavelength conversion member, andthe electrodes in the light emitting element may be appropriatelyselected from those known by a person skilled in the art, and variationsof such specific configurations are included in the scope of the presentinvention as long as a person skilled in the art can similarly implementthe invention and similar effects can be obtained.

Technically feasible combinations of two or more elements of thespecific examples are also within the scope of the present invention aslong as the combination of elements is within the spirit of the presentinvention.

In addition, all light emitting elements and methods of manufacturingthe light emitting elements that can be obtained by those skilled in theart with appropriate changes in design on the basis of the embodimentsdescribed above are within the scope of the present invention so long asthey are within the spirit of the present invention.

In addition, those skilled in the art can arrive at various alterationsand modifications in the field of the present invention, and thesealterations and modifications should be construed to be within the scopeof the present invention.

What is claimed is:
 1. A light emitting element comprising: a lightreflecting member comprising a first region and a second region; a firstsemiconductor layered body disposed between the first region and thesecond region and configured to emit first light having a first peakwavelength; a second semiconductor layered body disposed between thefirst semiconductor layered body and the second region and configured toemit second light having a second peak wavelength different from thefirst peak wavelength; a base member disposed between the firstsemiconductor layered body and the second semiconductor layered body;and a wavelength conversion member on which the first light and thesecond light are incident, wherein, when the first light and the secondlight are emitted from the first semiconductor layered body and thesecond semiconductor layered body, respectively, the wavelengthconversion member produces third light having a third peak wavelengthdifferent from the first peak wavelength and the second peak wavelength,the wavelength conversion member comprising: a first portion, a secondportion, and a third portion disposed between the first portion and thesecond portion in a first direction from the first region to the secondregion, and facing the base member, wherein: a reflectance of the lightreflecting member to the first light is higher than a reflectance of thewavelength conversion member to the first light, a reflectance of thelight reflecting member to the second light is higher than a reflectanceof the wavelength conversion member to the second light, a portion ofthe first region is located between the first portion and a portion ofthe first semiconductor layered body in a second direction perpendicularto the first direction, a portion of the second region is locatedbetween the second portion and a portion of the second semiconductorlayered body in the second direction, and when the first light and thesecond light are emitted from the first semiconductor layered body andthe second semiconductor layered body, respectively, the first light andthe second light propagate in the base member and are incident on thethird portion.
 2. The light emitting element according to claim 1,wherein: the light reflecting member further comprises a third region, afourth region and a fifth region, the first semiconductor layered body,the second semiconductor layered body and the base member are locatedbetween the third region and the fourth region in a third directionperpendicular to a plane extending along the first direction and thesecond direction, and the first semiconductor layered body, the secondsemiconductor layered body and the base member are located between thewavelength conversion member and the fifth region in the seconddirection.
 3. The light emitting element according to claim 1, wherein:the first semiconductor layered body and the second semiconductorlayered body comprise a nitride semiconductor, and the base membercomprises sapphire.
 4. The light emitting element according to claim 1,wherein: the first semiconductor layered body comprises: a first n-typesemiconductor layer, a first p-type semiconductor layer disposed betweenthe first n-type semiconductor layer and the first region, and a firstlight emitting layer disposed between the first n-type semiconductorlayer and the first p-type semiconductor layer, at least a portion ofthe first n-type semiconductor layer is in contact with the firstportion, and the portion of the first region is located between thefirst portion and the first p-type semiconductor layer in the seconddirection.
 5. The light emitting element according to claim 4, furthercomprising: a first n-side electrode electrically connected to the firstn-type semiconductor layer; and a first p-side electrode electricallyconnected to the first p-type semiconductor layer, wherein: at least aportion of the first n-side electrode is exposed from the first region,and at least a portion of the first p-side electrode is exposed from thefirst region.
 6. The light emitting element according to claim 5,wherein: the first region comprises a first end portion and a second endportion, the second end portion is located between the first end portionand the first portion in the second direction, the first n-sideelectrode comprises a first electrode end portion and a second electrodeend portion, the second electrode end portion is located between thefirst electrode end portion and the first portion in the seconddirection, and the first electrode end portion and the first end portionare in the same plane.
 7. The light emitting element according to claim6, wherein: the first p-side electrode comprises a third electrode endportion and a fourth electrode end portion, the fourth electrode endportion is located between the third electrode end portion and the firstportion in the second direction, and the third electrode end portion andthe first end portion are in the same plane.
 8. The light emittingelement according to claim 1, wherein: the second semiconductor layeredbody comprises: a second n-type semiconductor layer, a second p-typesemiconductor layer provided between the second n-type semiconductorlayer and the second region, and a second light emitting layer providedbetween the second n-type semiconductor layer and the second p-typesemiconductor layer, at least a portion of the second n-typesemiconductor layer is in contact with the second portion, and theportion of the second region is located between the second portion andthe second p-type semiconductor layer in the second direction.
 9. Thelight emitting element according to claim 8, further comprising: asecond n-side electrode electrically connected to the second n-typesemiconductor layer; and a second p-side electrode electricallyconnected to the second p-type semiconductor layer, wherein: at least aportion of the second n-side electrode is exposed from the secondregion, and at least a portion of the second p-side electrode is exposedfrom the second region.
 10. The light emitting element according toclaim 9, wherein: the second region comprises a third end portion and afourth end portion, the fourth end portion is located between the thirdend portion and the second portion in the second direction, the secondn-side electrode comprises a fifth electrode end portion and a sixthelectrode end portion, the sixth electrode end portion is locatedbetween the fifth electrode end portion and the second portion in thesecond direction, and the fifth electrode end portion and the third endportion are in the same plane.
 11. The light emitting element accordingto claim 10, wherein: the second p-side electrode comprises a seventhelectrode end portion and an eighth electrode end portion, the eighthelectrode end portion is located between the seventh electrode endportion and the second portion in the second direction, and the seventhelectrode end portion and the third end portion are in the same plane.12. The light emitting element according to claim 1, wherein: the basemember comprises: a first base member, and a second base member disposedbetween the first base member and the second semiconductor layered body,and the second base member is in contact with the first base member. 13.The light emitting element according to claim 1, wherein: the basemember comprises: a first base member, a second base member providedbetween the first base member and the second semiconductor layered body,and an intermediate layer provided between the first base member and thesecond base member, and an absolute value of a difference between arefractive index of the intermediate layer for the first light and arefractive index of the first base member for the first light is smallerthan an absolute value of a difference between a refractive index of thefirst semiconductor layered body for the first light and a refractiveindex of the first base member for the first light.
 14. A light emittingdevice comprising: the light emitting element according to claim 1; anda driving circuit, wherein: the driving circuit is configured to supplya first current to the first semiconductor layered body, and to supply asecond current to the second semiconductor layered body, and the drivingcircuit is configured to adjust a value of the first current and a valueof the second current individually.